[PATCH 06/19] drm/i915: properly clear IIR at irq_uninstall on Gen5+

[Paulo Zanoni <przanoni@gmail.com>]

From: Paulo Zanoni <paulo.r.zanoni@intel.com>

The IRQ_INIT and IRQ_FINI macros are basically the same thing, with
the exception that IRQ_FINI doesn't properly clear IIR twice and
doesn't have as many POSTING_READs as IRQ_INIT. So rename the macro to
IRQ_RESET and use it everywhere.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 76 +++++++++++++++--------------------------
 1 file changed, 28 insertions(+), 48 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 65dec2f..b77cbb8 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -85,7 +85,7 @@ static const u32 hpd_status_i915[] = { /* i915 and valleyview are the same */
  * Also, make sure callers of these macros have something equivalent to a
  * POSTING_READ on the IIR register.
  * */
-#define GEN8_IRQ_INIT_NDX(type, which) do { \
+#define GEN8_IRQ_RESET_NDX(type, which) do { \
 	I915_WRITE(GEN8_##type##_IMR(which), 0xffffffff); \
 	POSTING_READ(GEN8_##type##_IMR(which)); \
 	I915_WRITE(GEN8_##type##_IER(which), 0); \
@@ -94,7 +94,7 @@ static const u32 hpd_status_i915[] = { /* i915 and valleyview are the same */
 	I915_WRITE(GEN8_##type##_IIR(which), 0xffffffff); \
 } while (0)
 
-#define GEN5_IRQ_INIT(type) do { \
+#define GEN5_IRQ_RESET(type) do { \
 	I915_WRITE(type##IMR, 0xffffffff); \
 	POSTING_READ(type##IMR); \
 	I915_WRITE(type##IER, 0); \
@@ -103,12 +103,6 @@ static const u32 hpd_status_i915[] = { /* i915 and valleyview are the same */
 	I915_WRITE(type##IIR, 0xffffffff); \
 } while (0)
 
-#define GEN5_IRQ_FINI(type) do { \
-	I915_WRITE(type##IMR, 0xffffffff); \
-	I915_WRITE(type##IER, 0); \
-	I915_WRITE(type##IIR, I915_READ(type##IIR)); \
-} while (0)
-
 /* For display hotplug interrupt */
 static void
 ironlake_enable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
@@ -2626,7 +2620,7 @@ static void ibx_irq_preinstall(struct drm_device *dev)
 	if (HAS_PCH_NOP(dev))
 		return;
 
-	GEN5_IRQ_INIT(SDE);
+	GEN5_IRQ_RESET(SDE);
 	/*
 	 * SDEIER is also touched by the interrupt handler to work around missed
 	 * PCH interrupts. Hence we can't update it after the interrupt handler
@@ -2641,9 +2635,9 @@ static void gen5_gt_irq_preinstall(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	GEN5_IRQ_INIT(GT);
+	GEN5_IRQ_RESET(GT);
 	if (INTEL_INFO(dev)->gen >= 6)
-		GEN5_IRQ_INIT(GEN6_PM);
+		GEN5_IRQ_RESET(GEN6_PM);
 	POSTING_READ(GTIIR);
 }
 
@@ -2655,7 +2649,7 @@ static void ironlake_irq_preinstall(struct drm_device *dev)
 
 	I915_WRITE(HWSTAM, 0xeffe);
 
-	GEN5_IRQ_INIT(DE);
+	GEN5_IRQ_RESET(DE);
 
 	gen5_gt_irq_preinstall(dev);
 
@@ -2699,18 +2693,18 @@ static void gen8_irq_preinstall(struct drm_device *dev)
 	I915_WRITE(GEN8_MASTER_IRQ, 0);
 	POSTING_READ(GEN8_MASTER_IRQ);
 
-	GEN8_IRQ_INIT_NDX(GT, 0);
-	GEN8_IRQ_INIT_NDX(GT, 1);
-	GEN8_IRQ_INIT_NDX(GT, 2);
-	GEN8_IRQ_INIT_NDX(GT, 3);
+	GEN8_IRQ_RESET_NDX(GT, 0);
+	GEN8_IRQ_RESET_NDX(GT, 1);
+	GEN8_IRQ_RESET_NDX(GT, 2);
+	GEN8_IRQ_RESET_NDX(GT, 3);
 
 	for_each_pipe(pipe) {
-		GEN8_IRQ_INIT_NDX(DE_PIPE, pipe);
+		GEN8_IRQ_RESET_NDX(DE_PIPE, pipe);
 	}
 
-	GEN5_IRQ_INIT(GEN8_DE_PORT_);
-	GEN5_IRQ_INIT(GEN8_DE_MISC_);
-	GEN5_IRQ_INIT(GEN8_PCU_);
+	GEN5_IRQ_RESET(GEN8_DE_PORT_);
+	GEN5_IRQ_RESET(GEN8_DE_MISC_);
+	GEN5_IRQ_RESET(GEN8_PCU_);
 	POSTING_READ(GEN8_PCU_IIR);
 
 	ibx_irq_preinstall(dev);
@@ -3000,32 +2994,17 @@ static void gen8_irq_uninstall(struct drm_device *dev)
 
 	I915_WRITE(GEN8_MASTER_IRQ, 0);
 
-#define GEN8_IRQ_FINI_NDX(type, which) do { \
-		I915_WRITE(GEN8_##type##_IMR(which), 0xffffffff); \
-		I915_WRITE(GEN8_##type##_IER(which), 0); \
-		I915_WRITE(GEN8_##type##_IIR(which), 0xffffffff); \
-	} while (0)
-
-#define GEN8_IRQ_FINI(type) do { \
-		I915_WRITE(GEN8_##type##_IMR, 0xffffffff); \
-		I915_WRITE(GEN8_##type##_IER, 0); \
-		I915_WRITE(GEN8_##type##_IIR, 0xffffffff); \
-	} while (0)
+	GEN8_IRQ_RESET_NDX(GT, 0);
+	GEN8_IRQ_RESET_NDX(GT, 1);
+	GEN8_IRQ_RESET_NDX(GT, 2);
+	GEN8_IRQ_RESET_NDX(GT, 3);
 
-	GEN8_IRQ_FINI_NDX(GT, 0);
-	GEN8_IRQ_FINI_NDX(GT, 1);
-	GEN8_IRQ_FINI_NDX(GT, 2);
-	GEN8_IRQ_FINI_NDX(GT, 3);
-
-	for_each_pipe(pipe) {
-		GEN8_IRQ_FINI_NDX(DE_PIPE, pipe);
-	}
+	for_each_pipe(pipe)
+		GEN8_IRQ_RESET_NDX(DE_PIPE, pipe);
 
-	GEN8_IRQ_FINI(DE_PORT);
-	GEN8_IRQ_FINI(DE_MISC);
-	GEN8_IRQ_FINI(PCU);
-#undef GEN8_IRQ_FINI
-#undef GEN8_IRQ_FINI_NDX
+	GEN5_IRQ_RESET(GEN8_DE_PORT_);
+	GEN5_IRQ_RESET(GEN8_DE_MISC_);
+	GEN5_IRQ_RESET(GEN8_PCU_);
 
 	POSTING_READ(GEN8_PCU_IIR);
 }
@@ -3065,18 +3044,19 @@ static void ironlake_irq_uninstall(struct drm_device *dev)
 
 	I915_WRITE(HWSTAM, 0xffffffff);
 
-	GEN5_IRQ_FINI(DE);
+	GEN5_IRQ_RESET(DE);
 	if (IS_GEN7(dev))
 		I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
 
-	GEN5_IRQ_FINI(GT);
+	GEN5_IRQ_RESET(GT);
 	if (INTEL_INFO(dev)->gen >= 6)
-		GEN5_IRQ_FINI(GEN6_PM);
+		GEN5_IRQ_RESET(GEN6_PM);
+	POSTING_READ(GTIIR);
 
 	if (HAS_PCH_NOP(dev))
 		return;
 
-	GEN5_IRQ_FINI(SDE);
+	GEN5_IRQ_RESET(SDE);
 	if (HAS_PCH_CPT(dev) || HAS_PCH_LPT(dev))
 		I915_WRITE(SERR_INT, I915_READ(SERR_INT));
 }
-- 
1.8.4.2